What is the purpose of a backwash process in filtration systems?

The backwash process in filtration systems is primarily designed to clean the filter media. By reversing the flow of water, accumulated contaminants and particulates that have been trapped in the media are dislodged and carried away, restoring the effectiveness of the filter. This process is crucial for maintaining optimal filtration performance, reducing pressure drop across the filter, and ensuring high-quality water output.

When filters accumulate dirt and other contaminants, they can become less efficient, leading to a decrease in flow rate and possibly affecting water quality. Regular backwashing helps mitigate these issues by flushing out the contaminants, allowing the system to operate efficiently again.

The other options focus on aspects that are not related to the primary function of backwashing. While increasing pressure, adding chemicals, or setting media in place may be related to the overall operation of a filtration system, they do not encapsulate the essential purpose of backwash, which is to cleanse the media and prolong its lifespan and performance.